diff --git a/arch/arm/src/kinetis/hardware/kinetis_k28memorymap.h b/arch/arm/src/kinetis/hardware/kinetis_k28memorymap.h
index c651a885a3a..90a48d57565 100644
--- a/arch/arm/src/kinetis/hardware/kinetis_k28memorymap.h
+++ b/arch/arm/src/kinetis/hardware/kinetis_k28memorymap.h
@@ -144,7 +144,7 @@
 #  define KINETIS_OSC_BASE           0x40065000 /* System oscillator (OSC) */
 #  define KINETIS_I2C0_BASE          0x40066000 /* I2C 0 */
 #  define KINETIS_I2C1_BASE          0x40067000 /* I2C 1 */
-#  define KINETIS_USBOTGFS_BASE      0x40072000 /* USB OTG FS/LS */
+#  define KINETIS_USB0_BASE          0x40072000 /* USB OTG FS/LS */
 #  define KINETIS_2C2D_BASE          0x40073000 /* 2C2D (Analog comparator (CMP) /
                                                  * 6-bit digital-to-analog converter (DAC)) */
 #  define KINETIS_VREF_BASE          0x40074000 /* Voltage reference (VREF) */
diff --git a/boards/arm/kinetis/freedom-k28f/include/board.h b/boards/arm/kinetis/freedom-k28f/include/board.h
index 8dcee67bc38..4f80aa7fa61 100644
--- a/boards/arm/kinetis/freedom-k28f/include/board.h
+++ b/boards/arm/kinetis/freedom-k28f/include/board.h
@@ -84,7 +84,7 @@
  */
 
 #define BOARD_PRDIV          1        /* PLL External Reference Divider */
-#define BOARD_VDIV           25       /* PLL VCO Divider (frequency multiplier) */
+#define BOARD_VDIV           24       /* PLL VCO Divider (frequency multiplier) */
 
 /* Define additional MCG_C2 Setting */
 
@@ -97,10 +97,10 @@
 
 /* SIM CLKDIV1 dividers */
 
-#define BOARD_OUTDIV1        1              /* Core        = MCG,    180   MHz */
-#define BOARD_OUTDIV2        3              /* Bus         = MCG / 3, 60   MHz */
-#define BOARD_OUTDIV3        3              /* FlexBus     = MCG / 3, 60   MHz */
-#define BOARD_OUTDIV4        7              /* Flash clock = MCG / 7, 25.7 MHz */
+#define BOARD_OUTDIV1        1              /* Core        = MCG,    144   MHz */
+#define BOARD_OUTDIV2        2              /* Bus         = MCG / 2, 72   MHz */
+#define BOARD_OUTDIV3        2              /* FlexBus     = MCG / 2, 72   MHz */
+#define BOARD_OUTDIV4        6              /* Flash clock = MCG / 6, 24   MHz */
 
 #define BOARD_CORECLK_FREQ   (BOARD_MCG_FREQ / BOARD_OUTDIV1)
 #define BOARD_BUS_FREQ       (BOARD_MCG_FREQ / BOARD_OUTDIV2)
@@ -117,13 +117,12 @@
 /* N.B. The above BOARD_SOPT2_FREQ precludes use of USB with a 12 MHz Xtal
  * Divider output clock = Divider input clock × [ (USBFRAC+1) / (USBDIV+1) ]
  *     SIM_CLKDIV2_FREQ = BOARD_SOPT2_FREQ × [ (USBFRAC+1) / (USBDIV+1) ]
- *                48MHz = 168MHz X [(1 + 1) / (6 + 1)]
- *                48MHz = 168MHz / (6 + 1) * (1 + 1)
+*                48MHz = 144MHz / (2 + 1) * (1 + 0)
  */
 
-#if (BOARD_MCG_FREQ == 168000000L)
-#  define BOARD_SIM_CLKDIV2_USBFRAC     2
-#  define BOARD_SIM_CLKDIV2_USBDIV      7
+#if (BOARD_SOPT2_FREQ == 144000000L)
+#  define BOARD_SIM_CLKDIV2_USBFRAC     1
+#  define BOARD_SIM_CLKDIV2_USBDIV      3
 #  define BOARD_SIM_CLKDIV2_FREQ        (BOARD_SOPT2_FREQ / \
                                          BOARD_SIM_CLKDIV2_USBDIV * \
                                          BOARD_SIM_CLKDIV2_USBFRAC)
diff --git a/boards/arm/kinetis/freedom-k28f/src/k28_bringup.c b/boards/arm/kinetis/freedom-k28f/src/k28_bringup.c
index 4bb36712a49..8f9b8c7fd95 100644
--- a/boards/arm/kinetis/freedom-k28f/src/k28_bringup.c
+++ b/boards/arm/kinetis/freedom-k28f/src/k28_bringup.c
@@ -47,6 +47,10 @@
 
 #include "freedom-k28f.h"
 
+#ifdef CONFIG_PL2303
+#  include <nuttx/usb/pl2303.h>
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -130,6 +134,17 @@ int k28_bringup(void)
   k28_automount_initialize();
 #endif
 
+#if defined(CONFIG_USBDEV) && defined(CONFIG_KINETIS_USBOTG)
+  if (k28_usbdev_initialize)
+    {
+      k28_usbdev_initialize();
+    }
+#endif
+
+#ifdef CONFIG_PL2303
+  usbdev_serialinitialize(0);
+#endif
+
   UNUSED(ret);
   return OK;
 }